Road Equipment Manual Partially Revised After Chiba Flooding
Overview
Following the flooding incident at the Route 16 Murata-cho underpass during the August 2026 Chiba heavy rains, the Ministry of Land, Infrastructure, Transport and Tourism partially revised the Draft Road Equipment (Mechanical Equipment) Inspection, Maintenance, and Renewal Manual. The revision states that operational checks during annual inspections of road drainage equipment must, in principle, be conducted under actual load. The revised manual takes effect on October 6, 2026.
Key points
- Following the flooding incident during the Chiba heavy rains, the Draft Road Equipment Manual was partially revised.
- Operational checks during annual inspections must, in principle, be conducted under actual load.
- The revised manual takes effect on October 6, 2026.
Overview
During the August 2026 Chiba heavy rains, a flooding incident occurred at the Murata-cho underpass on Route 16. In response, the Ministry of Land, Infrastructure, Transport and Tourism partially revised the Draft Road Equipment (Mechanical Equipment) Inspection, Maintenance, and Renewal Manual to ensure that the entire system can be reliably checked for proper function.
Details
The revision outline states that inspections of road drainage equipment must confirm that the entire system functions reliably under actual operating conditions, regardless of system configuration. Accordingly, it specifies that operational checks during annual inspections must, in principle, be conducted under actual load. The revised manual takes effect on October 6, 2026.
The revised manual is published on the Ministry of Land, Infrastructure, Transport and Tourism website. The attached document is “Appendix 1: Comparison Table for the Draft Road Equipment (Mechanical Equipment) Inspection, Maintenance, and Renewal Manual.”